William m



W. H. FISHER.: Steam-Boiler.

(No Model.)

No. 228,521. Patented .lune 8,1880.

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"7 j All@ Unirse STATES ArnNr Frise.

WILLIAM M. FISHER, OF CINCINNATI, OHIO, ASSIGNOR TO AMERICAN BOILER AND FURNACE COMPANY, OF SAME PLACE.

sTEAi-BOILER.

SPECIFICATION forming part of Letters Patent No. 228,521, dated June 8, 1880.

Application filed March 25, 1880. (No model.)

To all whom it may concern: l

Be it known that I, WILLIAM MACK FISHER, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Steam-Boilers, Boiler-Furnaces, Evaporators, 85e.; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as willenable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form apart of this speciication.

This invention is an improvement on the invention described in United States Letters Patent No. 225,051, granted to me on the 2d day of March, A. D. 1880, and was devised with a view of effectin g a still more thorough combustion and consumption of the combustible gases proceeding' from a steam-boiler, furnace, or other fluid heating and evaporating furnace, and increasing the circulation of the fluid to facilitate and hasten its vaporization or evaporation by a more constant generation of vapor.

To these ends the improvement consists, mainly, in the application to the boiler of an additional legged fluid-partition, one or more, depending into the second or supplementary combustion-chamber, so as to compel the hot gases (the main volume thereof) to pass in a tortuous direction through this supplementary combustion-chamber, retarding them sufciently to supply them with the needed amount of atmospheric oxygen to complete combustion. The additional legged duid-partition effects at the same time an increase of circulation of the contents of the boiler.

In order that my improvement may be clearly understood, I will proceed to give a detailed description of the same as applied to a steam-boiler and an evaporator respectively, in connection with the annexed drawings, of which- Figure 1 is a sectional perspective view of a horizontal flue-boiler embodying my improvement. Fig. 2 is a transverse vertical section of said boiler, the section being taken in the plane indicated by broken line a; of Fig..l.

Fig. 3 is a sectional perspective view of an evaporator embodying my improvement.

A refers to an ordinary horizontal flue-boiler for generating steam, suitably set in masonry. The re-chamberB, inthe exam ple illustrated, is adapted for the burning of lump coal and similar fuel.

It may be remarked, however, that my invention may be used with equal advantage in steam-boiler and other furnaces adapted for the burning of other kinds of fuel, such as liquid fuel or coal-dust.

The lump coal is burned on the grate-surface B', under which there is the usual ashpit B2.

The back or rear end of the lire-chamber B is formed by the hollow partition C, constructed at its respective ends with hollow legs C' and C2, by which it is connected with the boiler. Leg C', covering an opening in the shell of the boiler, communicates with the lower portion ofthe water therein. Leg C2 extends up into the water-space of the boiler, and its open upper end may terminate either in the steamspace-thereof or in the water-space near the water-line, as shown. The main volume of the flame and gases proceeding from the nre-chamber passes over the top of this partition through the passage-way C3 betweenits legs, and the balance through the narrow passages between said legs and the side walls of the fire-chamber.

The partition C extends down to the gratesurface. The narrow passages between the legs of the partition and the side walls are of 8 5 advantage in distributing the heat more uniformly over the whole surface of the legged partition.

A second or supplementary combustionchamber, D, is formed between the hollowlegged partition C and the bridge-wall E. This chamber D has a perforated bottom, D', through which atmospheric air enters in jets to mingle with the products of combustion passing through this chamber, and supply the necessary oxygen for the ignition of combustible gases not previously ignited or in an incomplete state of combustion. A second hollow-legged partition, F, depends from the boiler into this chamber D, differing from the partition G only in not extending down to the bottom of the chamber, and having its top edge pretty close up to the bottom of the boiler. This pendent hollow-legged partition compels the main volume of llame and gases to travel in a tortuous direction through the supplemeutary combustion-chamber, so that the gases are retained therein long enough to supply them wi-th all the atmospheric oxygen needed to complete combustion. This function ot' the second water-partition is necessarily accompanied by an increase of heat in the supplementary combustion-chamber, which is measurably compensated for by the rapid absorption of heat by this pendent water-partition.

By reason of their described legged construction, the, water-partitions are very effective circula-tors, the less-heated water constantlyv descending one leg, while vthe more highlyheated mingled steam and water as consta-ntly ascend the other leg. Hence the generation of steam in them will be uniformly constant, and overheating and consequent sudden eruptions of steam be avoided. The circulation ot' water through the water-partitions necessarily eit'ects a more or less active circulation ofthe water in the boiler, and this may be increased by the application of one or more pendent water-partitions, like the one (marked F) beyond the bridge-wall E. One such additional pendent partition is shown in dotted lines in Fig. 1. The water-partitions may be so arranged that the long legs of two adjacent ones shall be on opposite sides of the boiler, as shown in Fig. 1. The pendent water-partition in the supplelnentary combustion-ehamber and those beyond the bridge-wall, if used, may be arranged atan angle of declination,it' deemed expedient.

As a matter ot' course, the invention is applicable to the various kinds of portable and stationary boilers, including locomotive and marine boilers. It may also be applied with advantage to evaporating-pans, vats, stills, and the like. Fig. 3 illustrates an instance of its use in connection with an evaporating-pan, G, placed over a furnace similar in construction to the boiler-furnace shown in Figs. l and 2. The legged water-partitions C and F are connected to the superimposed reservoir Il, so that the fluid therefrom will circulate through said partitions.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. rlhe combination, substantially as before set forth, of a steam-boiler or other means for holding a iiuid to be vaporized or evaporated, the tire-chamber, the hollow partition at the rear end ot the lire-chamber, and constructed with hollow legs, one of which opens into the lower part ot' the water-space, while the other extends to the steam-space, or thercabout, and one or more pendent hollow similarly legged partitions beyond the irechamben 2. rlhe combination, substantially as before set forth, of a steam-boiler or other means for holding fluid to be vaporized or evaporated, the lire-chamber, the hollow partition at the rear end of the fire-chamber, and constructed ,with hollow legs, one of' which opens into the lower part of the water-space, while the other extends to the steam-space, or thereabout, the second combustion-chamber, and a pendent hollow similarly legged partition in said second combustion-chainber.

In testimony whereof lf affix my signature in presence of two witnesses.

/VILLIAM MACK FISHER..

Witnesses:

JOHN H. WooDWAnD, lnoMAs C. MINOR. 

